One of my collegues is having this weird issue. He can connect a bitmap, an image node to the Physical and Standard Shader. He can render and see the preview.
However, when he connects any OSL node to the base colour nothing happens.
No preview and it doesn't render. Computer was restarted, Arnold was updated. We tried on a new scene and nothing. I can open his file on my PC and is fine.
So, we picked the the Simple Tiles OSL node, copy the code, opened an OSL Map. Pasted the code, compile it and still nothing.
We switched to Corona just to double check and it works
So then checked the log and this stands out
[osl] C:\Program Files\Autodesk\<buffer>:1: error: error: could not find include file: C:\Users athand\AppData\Local\Temp/bc2f-15da-ea72-f926 00:00:00 1463MB WARNING | unable to connect osl() to standard_surface(ba se_color) - types are not compatible ((null) to RGB)
I also noticed that the Arnold Preview seems to have a watermark. We checked and he is using his autodesk account to use 3ds Max, which is fine.